Tests: Asynchronous iSCSI Multipath Compare And Write

Dispatch a number of Compare And Write requests simultaneously via
separate iSCSI sessions and await all responses.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/iscsi-test-cu.h

@@ -309,5 +309,6 @@ void test_writeverify16_residuals(void);
 void test_multipathio_simple(void);
 void test_multipathio_reset(void);
 void test_multipathio_compareandwrite(void);
+void test_mpio_async_caw(void);
 
 #endif        /* _ISCSI_TEST_CU_H_ */